Fexofenadine (trade names Allegra Fexidine Telfast Fastofen Tilfur Vifas Telfexo Allerfexo) is an antihistamine pharmaceutical drug used in the treatment of allergy symptoms such as hay fever nasal congestion and urticaria.It was developed as a successor of and safer alternative to terfenadine (trade names include Triludan and Seldane) an antihistamine that caused QT interval prolongation potentially leading to cardiac arrhythmia.
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